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rock butter
Rock butter (also known as stone butter) is a soft mineral substance found oozing from alum slates. It consists of native alum mixed with clay and oxide of iron, usually in soft masses of a yellowish white colour, occurring in cavities and fissures in argillaceous slate. == References ==
* http://dict.die.net/rock%20butter/—has information from Webster's Revised Unabridged Dictionary (1913) * (Rock Butter ), from the U.S. Bureau of Mines' ''Dictionary of Mining, Mineral, and Related Terms'' (1996), online at the Hacettepe University Department of Mining Engineering website. * *
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「rock butter」の詳細全文を読む
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